Loss of mitochondrial calcium uniporter rewires skeletal muscle metabolism and substrate preference.

Loss of mitochondrial calcium uniporter rewires skeletal muscle metabolism and substrate preference.
复制标题

线粒体钙单向转运体的丢失重新连接骨骼肌代谢和底物偏好。

DOI:
10.1038/s41418-018-0191-7
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发表时间:
2019-01
影响因子:
12.4
通讯作者:
Mammucari C
Mammucari C
中科院分区:
生物学1区
文献类型:
--
作者:
Gherardi G;Nogara L;Ciciliot S;Fadini GP;Blaauw B;Braghetta P;Bonaldo P;De Stefani D;Rizzuto R;Mammucari C

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由于线粒体钙单通道(MCU)的活性,骨骼肌线粒体在SR储存释放刺激下容易积累Ca2+,这是负责线粒体Ca2+摄取的高度选择性通道。MCU在生理条件下积极调节肌纤维大小,并抵消肌肉质量的病理损失。在这里,我们发现骨骼肌特异性MCU缺失抑制肌纤维线粒体Ca2+摄取,损害肌肉力量和运动表现,并决定mhc表达的慢速到快速转换。线粒体Ca2+摄取是有效葡萄糖氧化所必需的,事实证明,在肌肉特异性MCU-/-肌纤维中,氧化代谢受损,糖酵解速率增加。虽然有缺陷,但线粒体活性部分是通过增加脂肪酸氧化来维持的。在MCU-/-肌纤维中,PDP2过表达显著降低fa依赖性,表明PDH活性降低是MCU-/-肌代谢重连接的主要触发因素。因此,PDK4在mcfl /fl肌纤维中的过表达足以增加fa依赖性呼吸。最后,由于肌肉特异性MCU缺失,会发生影响肝脏和脂肪组织代谢的系统性分解代谢反应。
Skeletal muscle mitochondria readily accumulate Ca2+ in response to SR store-releasing stimuli thanks to the activity of the Mitochondrial Calcium Uniporter (MCU), the highly selective channel responsible for mitochondrial Ca2+ uptake. MCU positively regulates myofiber size in physiological conditions, and counteracts pathological loss of muscle mass. Here, we show that skeletal muscle-specific MCU deletion inhibits myofiber mitochondrial Ca2+ uptake, impairs muscle force and exercise performance, and determines a slow-to fast switch in MHCs expression. Mitochondrial Ca2+ uptake is required for effective glucose oxidation, as demonstrated by the fact that in muscle-specific MCU-/- myofibers oxidative metabolism is impaired and glycolysis rate is increased. Although defective, mitochondrial activity is partially sustained by increased fatty acid (FA) oxidation. In MCU-/- myofibers, PDP2 overexpression drastically reduces FA-dependency, demonstrating that decreased PDH activity is the main trigger of the metabolic rewiring of MCU-/- muscles. Accordingly, PDK4 overexpression in MCUfl/fl myofibers is sufficient to increase FA-dependent respiration. Finally, as a result of the muscle-specific MCU deletion, a systemic catabolic response impinging on both liver and adipose tissue metabolism occurs.
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